Srivastava, S. et al. 2010. Co-ordination Complexes of Tetradentate N2O2 Donor Macrocyclic Ligand (b,i) Dibenzo-m-(dinitrobenzo)5,8- diaza, 1,12-dioxocyclotetradeca 4,8-diene with Cu(II), Ni(II), and Co(II) . Asian Journal of Chemistry. 4, 1 (Mar. 2010), 184–187.